How to make plane tracked video start compositing from a certain frame?
I found it out:
I fixed it by looking at this post (How can I make a &quot;Movie Clip&quot; node start at a certain frame of the scene?). I replaced the &quot;movie clip' nodes for &quot;image&quot; nodes, and put the background video at &quot;Start from 1910, and Offset 1910&quot;. Then I offset the composited video to 1910 frames. Voila!
I had to scrub through the timeline to check that it was precisely matched. I rendered a smaller sequence once to check through it, and then returned to the project to &quot;finely&quot; adjust it down to each frame.
Stackexchange is a wonder, really :O